tor/changes/ticket40755

  o Minor features (metrics):
    - Add service side metrics for REND and introduction request failures.
      Closes ticket 40755.
metrics: Add metrics for rendezvous and introduction request failures. This introduces a couple of new service side metrics: * `hs_intro_rejected_intro_req_count`, which counts the number of introduction requests rejected by the hidden service * `hs_rdv_error_count`, which counts the number of rendezvous errors as seen by the hidden service (this number includes the number of circuit establishment failures, failed retries, end-to-end circuit setup failures) Closes #40755. This partially addresses #40717. Signed-off-by: Gabriela Moldovan <gabi@torproject.org> 2023-02-10 13:20:23 +01:00			`o Minor features (metrics):`
			`- Add service side metrics for REND and introduction request failures.`
			`Closes ticket 40755.`